The article by Kim et al1 brings to light a larger topic—namely, how does one “prove” safety, either in general or specifically within the magnetic resonance imaging (MRI) environment? For example, in the case of cochlear implants, several studies have documented the “safety” of MRI exposure by numerous patients with various cochlear implants. Why, then, did the patients in the study by Kim et al experience adverse events or pain, even to the point of terminating the examination?